<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>商品列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <el-row :gutter="20">
                <el-col :span="8">
                    <el-input placeholder="请输入内容" v-model="queryInfo.query" clearable @clear="getGoodsList">
                        <el-button slot="append" icon="el-icon-search" @click="getGoodsList"></el-button>
                    </el-input>
                </el-col>
                <el-col :span="4">
                    <el-button type="primary" @click="goAddpage">添加商品</el-button>
                </el-col>
            </el-row>

            <!-- table表格区域 -->
            <el-table :data="goodslist" border stripe>
                <el-table-column type="index"></el-table-column>
                <el-table-column label="商品名称" prop="goods_name"></el-table-column>
                <el-table-column label="商品价格（元）" prop="goods_price" width="110px"></el-table-column>
                <el-table-column label="商品重量" prop="goods_weight" width="70px"></el-table-column>
                <el-table-column label="创建时间" width="140px">
                    <template slot-scope="scope">
                        {{scope.row.add_time | dateFormat}}
                    </template>
                </el-table-column>
                <el-table-column label="操作" width="130px">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini" @click="editGoodsById(scope.row.goods_id)"></el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeById(scope.row.goods_id)"></el-button>
                    </template>
                </el-table-column>
            </el-table>

            <!-- 分页区域 -->
            <el-pagination
            @size-change="handleSizeChange"
            @current-change="handleCurrentChange"
            :current-page="queryInfo.pagenum"
            :page-sizes="[5, 10, 15, 20]"
            :page-size="queryInfo.pagesize"
            layout="total, sizes, prev, pager, next, jumper"
            :total="total"
            background>
            </el-pagination>
        </el-card>

        <!-- 修改商品对话框 -->
        <el-dialog
        title="修改商品"
        :visible.sync="editGoodsVisible"
        width="50%"
        @close="editGoodsDialogClosed">
          <el-form :model="editGoodslist" :rules="editGoodsRules" ref="editGoodsRef" label-width="100px">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="editGoodslist.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="editGoodslist.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="editGoodslist.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="editGoodslist.goods_weight"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editGoodsVisible = false">取 消</el-button>
            <el-button type="primary" @click="editGoods">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
      // 查询参数对象
      queryInfo: {
        query: '',
        pagenum: 1,
        pagesize: 10
      },
      // 商品列表
      goodslist: [],
      // 总数据条数
      total: 0,
      // 控制修改商品对话框的展示与隐藏
      editGoodsVisible: false,
      // 获取到的商品数据
      editGoodslist: {},
      // 修改商品的表单验证规则对象
      editGoodsRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  created() {
    this.getGoodsList()
  },
  methods: {
    // 根据分页获取对应的商品列表
    async getGoodsList() {
      const { data: res } = await this.$http.get('goods', { params: this.queryInfo })
      if (res.meta.status !== 200) return this.$message.error('获取商品列表失败！')
      this.goodslist = res.data.goods
      this.total = res.data.total
    },
    // 页面尺寸改变处理函数
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getGoodsList()
    },
    // 页码改变处理函数
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getGoodsList()
    },

    // 根据Id删除对应的商品信息
    async removeById(id) {
      // 弹框询问用户是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该商品, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除，则返回值为字符串 confirm
      // 如果用户取消删除，则返回值为字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete('goods/' + id)
      if (res.meta.status !== 200) return this.$message.error('删除用户失败！')
      this.$message.success('删除商品成功！')
      this.getGoodsList()
    },
    goAddpage() {
      this.$router.push('/goods/add')
    },
    // 获取商品信息与显示修改商品的对话框
    async editGoodsById(id) {
      const { data: res } = await this.$http.get('goods/' + id)
      if (res.meta.status !== 200) return this.$message.error('获取商品信息失败！')
      this.editGoodslist = res.data
      this.editGoodsVisible = true
    },
    // 修改商品对话框的关闭事件
    editGoodsDialogClosed() {
      this.$refs.editGoodsRef.resetFields()
    },
    // 点击按钮修改商品信息
    editGoods() {
      this.$refs.editGoodsRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`goods/${this.editGoodslist.goods_id}`, this.editGoodslist)
        if (res.meta.status !== 200) return this.$message.error('修改商品失败！')
        this.$message.success('修改商品信息成功！')
        this.editGoodsVisible = false
        this.getGoodsList()
      })
    }
  }
}
</script>

<style lang="less" scoped>

</style>
